PICTURES: Using years of experience, detective built alleged murder weapon in unique case

HARRY FISHER / THE MORNING CALL

Lehigh County Detective Mark Garrett demonstrates how to use an air gun he constructed after Lehigh County District Attorney Jim Martin and members of Pennsylvania State Police, Troop M, held a news conference in the Lehigh County Courthouse on Wednesday, April 5, 2017. Martin announced that Josef Charles Raszler of Lower Macungie Township, has been charged in relation to the 2016 homicide of Stephanie Roof, of Lower Macungie. Township. Raszler has been charged with Criminal Homicide. Det. Mark Garrett, Commander of the Lehigh County Firearm and Tool Mark Laboratory, was able to make an air gun using materials similar to those found in Raszler's residence and following instructions on the internet from sites of searches made by the defendant. The air gun constructed by Det. Garrett is able to be discharged using compressed air and able to propel a projectile similar to the one found in Ms. Roof's front yard. It has characteristics believed to be similar to the air gun thought to have been used in the commission of this crime. ( Harry Fisher / The Morning Call)

Lehigh County Detective Mark Garrett demonstrates how to use an air gun he constructed after Lehigh County District Attorney Jim Martin and members of Pennsylvania State Police, Troop M, held a news conference in the Lehigh County Courthouse on Wednesday, April 5, 2017. Martin announced that Josef Charles Raszler of Lower Macungie Township, has been charged in relation to the 2016 homicide of Stephanie Roof, of Lower Macungie. Township. Raszler has been charged with Criminal Homicide. Det. Mark Garrett, Commander of the Lehigh County Firearm and Tool Mark Laboratory, was able to make an air gun using materials similar to those found in Raszler's residence and following instructions on the internet from sites of searches made by the defendant. The air gun constructed by Det. Garrett is able to be discharged using compressed air and able to propel a projectile similar to the one found in Ms. Roof's front yard. It has characteristics believed to be similar to the air gun thought to have been used in the commission of this crime. ( Harry Fisher / The Morning Call) (HARRY FISHER / THE MORNING CALL)

Det. Mark Garrett, Commander of the Lehigh County Firearm and Tool Mark Laboratory explains the use of high powered microscopes to collect evidence located at the Lehigh County Coroner's Office and Forensics Center in South Whitehall Township. Lehigh County detective Mark Garrett used PVC tubes, copper pipes, a sprinkler head valve and air tanks to build murder weapon. A look into one of the more complex murder cases in the county's history, the death of Stephanie Roof, killed by a lead projectile allegedly built by her neighbor and former boyfriend Josef Raszler.

Det. Mark Garrett, Commander of the Lehigh County Firearm and Tool Mark Laboratory explains the use of high powered microscopes to collect evidence located at the Lehigh County Coroner's Office and Forensics Center in South Whitehall Township. Lehigh County detective Mark Garrett used PVC tubes, copper pipes, a sprinkler head valve and air tanks to build murder weapon. A look into one of the more complex murder cases in the county's history, the death of Stephanie Roof, killed by a lead projectile allegedly built by her neighbor and former boyfriend Josef Raszler. (APRIL BARTHOLOMEW / THE MORNING CALL)

PHOTO GALLERY: Lehigh County detective Mark Garrett used PVC tubes, copper pipes, a sprinkler head valve and air tanks to build the possible weapon used in the death of Stephanie Roof. Roof was killed by a lead projectile allegedly built by her neighbor and former boyfriend Josef Raszler.